/Engine/Source/Runtime/Engine/Public/AudioDevice.h
This is called by aUSoundSubmixwhen we stop recording a submix on this device.
virtual [Audio::FAlignedFloatBuffer](API\Runtime\SignalProcessing\DSP\FAlignedFloatBuffer) & StopRecording ( [USoundSubmix](API\Runtime\Engine\Sound\USoundSubmix) * InSubmix, float & OutNumChannels, float & OutSampleRate )